Jet booster pump



A. E. NITTKA JET BOOSTER PUMP `luly 8, 1952 Filed Oct. 17. 1947 JNNToR. AL/@Q50 5. Mfr/(A *BY y, y?

Patented July 8, 19'52 1;*HKUNITED zsTATE-s Nien'rslvi oFFIcEj:

vJiri;noosrim.PUMPy p Y, v Anima a.nitf ka.,`o1eve1and,'ohio I Application October- 17, 1947, Serial No. 780,478

The-present invention relates vto a jet type pump and. an object of the invention is to provide a jet type pump in which the nozzle thereof is of-aparticular shape to provide a more efcientpumping actionthanafforded by the usual type of nozzles.

:Other objectsandadvantages of the invention will beapparent. from the following description of afpreierredk 4form of the invention, reference being made to the,M accompanying drawings wherein: l,

Fig. l is a view, partlyinsection, of a water wellandapumping system for the 4well including myimproved boosternjet pumps;.

.,Fig. 2 -is a fragmentaryVv view in section of one form of.,je t booster pump showing` the pattern of water ejected ,throught the jet structure;

Eig.3 is afragmentary view in section .of anotherform-.of'jet boosterpump; and,. y

Fig. 4 is a view .taken on line 4'-Il of .Fig. 2. f

It isfcommon practice to provide jet effects within the intake pipe of a well pump, for example, to assistyin `raising the level of water in the intake pipe and these jets are known as jet booster pumps. The .present invention is directed to a design of jet pump which produces a mum efficient economical operation of the jet. Referring now to Fig. 1 of the drawings, I have shown a Vwell casing W with a centrifugal pump P positioned above the well. The pump P may be of any well known motor driven centrifugal type having an intake pipe I tapped by a pipe S which extends to a storage tank, for example, not shown. The pump also includes an exhaust pipe E which extends down into the well alongside the intake pipe I. The pipe E furnishes water under pressure to two jet booster pumps A and B. When pump P operates water is drawn through the pipe I into the pump and exhausted through pipe E and the exhausted water is projected upwardly through the jet pumps in such a manner to produce a vacuum and thereby draw water upwardly into the vintake pipe I. Water not drawn into pump P flows through pipe S.

Referring more particularly to the jet structure shown at A, there is provided an outer sleeve I0 which is connected to the pipe I by a suitable coupling and an inlet elbow I I is connected to the lower part of the sleeve I0. An inner sleeve or nozzle I2 extends through the elbow II and projects into sleeve I0 and terminates within the sleeve. Preferably, a sleeve I3 is threaded on the lower end of the nozzle I2 and this sleeve is pro- 2` Claims. (Cl. 10S-260) vided with a grillIS across the bottom thereof` to exclude relatively large particles from. the inlet to pipe I. A valve stem IIB extends through'the nozzle and the upper end of the stem is provided with a tapered valve body I'Iwhich is adapted to seat on an annular valve seat I8 formed about the top of the nozzle I2. The lower end of stem I6 has a perforated vdisk I9 attached thereto which limits the upward movement of the `valve body I'I by engagement with the lower end -of the nozzle I2. The Valve and nozzle-structure thus far described is similar to that disclosed in my U. S. Patent No. 2,391,734 dated December 25,

1.945. As set forth in that patent the valve closes for subsequent operation is unnecessary..

Ahead 20 is formed about the upper end of the nozzle. I2 and I'have discoveredthat by forming the contour of the bead as herein disclosed water entering the elbow II and passing upwardly between the walls ofthe sleeves I0 and I2 will create a low pressure area immediately above the end of the nozzle I2 in such a manner that an extremely eicient pumping action will .draw water from the well upwardly through the-nozzle I2 and into the sleeve I0. I have discovered that the contour of the bead, when examined on a section taken on a radial plane of the nozzle I2, should be in the form of an arc having its center in a plane parallel to the plane of the end of the nozzle and the arc should extend through an angle from the said parallel plane of 55, approximately. In the drawing the parallel plane is indicated by the line 25 and the angle is indicated at a. The center of the arc is indicated at c. By forming the bead in this manner the water passing upwardly between the outer side of nozzle I2 and the inner wall of sleeve I0 is scattered or dispersed throughout an area above the end of the nozzle I2 in the manner illustrated in Fig. 2 which shows a jet structure similar to that'described, but without the valve. As may be seen, the pattern of the dispersion defines an inverted cone shaped area immediately above the end of Vnozzle I2 which area will be a low pressure area adjacent the nozzle end with a broad entraining stream which efciently propels water upwardly from the nozzle. This dispersion of the water throughout the area describedv creates a lower pressure area over the end of the nozzle than is possible in the usual jetv pumps in which the water is projected in a more or less solid stream which does not converge adjacent to the nozzle end. l

Referring now to the jet booster pump B, this pump is similar to that of A except that the valve I1 is eliminated and the sleeve 30, which corresponds to sleeve l0, has no enlargement therein but is straight walled. In this construction the sleeve 30 is connected in the intake pipe I and an elbow 3| is attached to the lower end thereof. An inner sleeve or nozzle 32 extends upwardly through the elbow 3l and terminates within the sleeve 30. ,The lower end of the nozzle 32 is connected by a suitable coupling to a pipe 33 which is connected to the upper end of the lower sleeve I0. The nozzle 32 is provided with a bead 35 surrounding the upper end thereof and the contour of the bead, when examined on a section taken on a radial plane through the nozzle, the outer edge of the bead is in the form of an arc which extends from a plane indicated at l35, which is parallel to the plane of the upper end of the nozzle, through a 60 angle, as indicated at b. The center of-v the arc is located in the plane indicated at 36. The vaction of thisl booster is similar to that of the booster A although there is no valve seat at the upper end of the nozzle v32. It will be noted in this connection I prefer'that the arc of the bead section intersects the inner wall of the nozzle 32 so that a sharp edge is formed about the top ofthe nozzle as indicated at 38.

The arcuate contours of the beads preferably extend from 55 to 6 0?, although a few degrees leeway may be had. The water flowing along these contoured surfaces tend to cling to the surfaces so that a dispersion as described occurs.

I also deem it important that the upper end edge of the inner sleeve be relatively sharp so that there will be a minimum of surface to which the water will tend to adhere.

Comparative tests show that the jet structure described herein will produce a much more stable and stronger stream of water. 4

Tests show that for the saine head pressure on the jet stream a decidedly greater volume of liqan inner concentric sleeve, the inner sleeve having a bead surrounding the end thereof within the outer sleeve, said bead having a diameter greater than the diameter of the inner sleeve upon which it is formed whereby liquid flowing between the inner and outer sleeves is considerably accelerated in velocity at said bead, the outer end contour of the bead, viewed in longitudinal cross-section, being in the form of an arc vextending through substantially =60 from the end of the inner sleeve and terminating in a transverse plane through the maximum diameter of the bead, the center for scribing said arc lying on said transverse plane approximately intermediate the longitudinal axis of the inner sleeve and the bore thereof, vfor dispersing liquid owing thereover 4in conical convergence closely adjacent the end of said inner sleeve, and thereby creating a strong suction adjacent the end of the inner sleeve.

2. A jet pump comprising an outer sleeve and an inner concentric sleeve, the inner sleeve having a bead surrounding the end thereof within the outer sleeve, the diameter `of the outer ysleeve in the area immediately adjacent the bead being constant, said bead having a diameter greater than the diameter of the inner sleeveupon which it is formed whereby liquid flowing between the inner and outer sleeves is considerably accelerated in velocity at saidV bead, the outer end contour of the-bead, viewed in central longitudinal crosssection, being in the form of an arc, which has its axis on a transverse plane at right angles to the longitudinal= axis 'of th'e inner sleeve extending throughthe maximum diameter of the bead, the center for scribing said arc lying on said transverse plane approximately intermediate the cen'- tral longitudinal axis 'of theinner sleeve and the bore thereof,-for dispersing liquid flowing thereover in conical'converg'e'nc'e closely adjacent the end of said inner sleeve,V andthereby creating a strong suction adjacent the end of the inner sleeve.

ALFRED E. NITTKA.

REFERENCES CITED The following references are of record in the lilo of this patent: l

n UNITED STATES .y PATENTS 

